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Liu Z, Zeinalzadeh Z, Huang T, Han Y, Peng L, Wang D, Zhou Z, Ousmane D, Wang J. Identification of endoplasmic reticulum stress-associated genes and subtypes for predicting risk signature and depicting immune features in inflammatory bowel disease. Heliyon 2024; 10:e37053. [PMID: 39296237 PMCID: PMC11409092 DOI: 10.1016/j.heliyon.2024.e37053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 08/25/2024] [Accepted: 08/27/2024] [Indexed: 09/21/2024] Open
Abstract
Endoplasmic reticulum stress (ERS) becomes a significant factor in inflammatory bowel disease (IBD), like Crohn's disease (CD) and ulcerative colitis (UC). Our research was aimed at identifying molecular markers to enhance our understanding of ERS and inflammation in IBD, recognizing risk factors and high-risk groups at the molecular level, and developing a predictive model on the grounds of based on ERS-associated genes. This research adopted the least absolute shrinkage and selection operator (LASSO) regression and logistic regression to build a predictive model, and categorized IBD patients into high- and low-risk groups, and then identified four gene clusters. Our key findings included a significant increase in drug target gene expression in high-risk groups, notable discrepancies in immune levels, and functions between high-risk and low-risk groups. Notably, the TAP1 gene emerged as a strong predictor with the highest diagnostic value (area under the curve [AUC] = 0.941). TAP1 encodes proteins required for antigenic peptide transfer across the endoplasmic reticulum (ER) membrane, and its potential as a diagnostic marker and therapeutic target is reflected by its overexpression in IBD tissues. Our study established a new ERS-associated gene model which could forecast the risk, immunological status, and treatment efficacy of patients with IBD. These findings suggest potential targets for personalized therapy and highlight the significance of ERS in the etiology and therapy of IBD. Future studies should explore the therapeutic potential of targeting TAP1 and other ERS-related genes for IBD management.
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Affiliation(s)
- Ziyu Liu
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
- Ultrapathology (Biomedical electron microscopy) Center, Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
| | - Zahra Zeinalzadeh
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Tao Huang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Yingying Han
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Lushan Peng
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Dan Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Zongjiang Zhou
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Diabate Ousmane
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
| | - Junpu Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Department of Pathology, School of Basic Medicine, Central South University, Changsha City, Hunan Province, China
- Ultrapathology (Biomedical electron microscopy) Center, Department of Pathology, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha City, Hunan Province, China
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Booth MJ, Kobayashi LC, Janevic MR, Clauw D, Piette JD. No increased risk of Alzheimer's disease among people with immune-mediated inflammatory diseases: findings from a longitudinal cohort study of U.S. older adults. BMC Rheumatol 2021; 5:48. [PMID: 34763722 PMCID: PMC8588609 DOI: 10.1186/s41927-021-00219-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/14/2021] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVE Immune-mediated inflammatory diseases (IMID) are characterized by systemic inflammation affecting the joints and bodily organs. Studies examining the association between individual IMIDs and the risk of Alzheimer's disease (AD) have yielded inconsistent findings. This study examines AD risk across a group of IMIDs in a large population-based sample of older adults. METHODS Data on a national sample of US adults over age 50 was drawn from the Health and Retirement Study (HRS) and linked Medicare claims from 2006 to 2014. IMIDs include rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, Crohn's disease, ulcerative colitis, and related conditions. We identified IMIDs from 2006 to 2009 Medicare claims using International Classification of Diseases (ICD9-CM) codes. The date of incident AD was derived from Chronic Conditions Warehouse (CCW) identifiers. We examined the risk of AD from 2009 to 2014 using Cox proportional hazards models, both unadjusted and adjusted for age, gender, education, race, and the genetic risk factor APOE-e4. RESULTS One hundred seventy-one (6.02%) of the 2842 total HRS respondents with Medicare coverage and genetic data were classified with IMIDs. Over the subsequent 6 years, 9.36% of IMID patients developed AD compared to 8.57% of controls (unadjusted hazard ratio (HR): 1.09, 95% CI .66-1.81, p = 0.74). Adjusted HR 1.27 (95% CI 0.76-2.12, p = 0.35). Age (HR for 10-year increment 3.56, p < .001), less than high school education (HR 1.70, p = .007), and APOE-e4 (HR 2.61, p < .001 for one or two copies), were also statistically significant predictors of AD. CONCLUSION HRS respondents with common IMIDs do not have increased risk of Alzheimer's disease over a 6-year period.
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Affiliation(s)
- Michael J Booth
- Department of Health Behavior and Health Education, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48130, USA.
| | - Lindsay C Kobayashi
- Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, MI, USA
| | - Mary R Janevic
- Department of Health Behavior and Health Education, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48130, USA
| | - Daniel Clauw
- Department of Anesthesiology, Rheumatology, Psychiatry, Michigan Medicine, Ann Arbor, MI, USA
| | - John D Piette
- Department of Health Behavior and Health Education, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI, 48130, USA
- Department of Veterans Affairs Center for Clinical Management Research, Ann Arbor, MI, USA
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Glapa-Nowak A, Szczepanik M, Iwańczak B, Kwiecień J, Szaflarska-Popławska AB, Grzybowska-Chlebowczyk U, Osiecki M, Dziekiewicz M, Stawarski A, Kierkuś J, Banasiewicz T, Banaszkiewicz A, Walkowiak J. Apolipoprotein E variants correlate with the clinical presentation of paediatric inflammatory bowel disease: A cross-sectional study. World J Gastroenterol 2021; 27:1483-1496. [PMID: 33911469 PMCID: PMC8047531 DOI: 10.3748/wjg.v27.i14.1483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 11/17/2020] [Accepted: 02/25/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND It has been suggested that apolipoprotein E (APOE) polymorphisms are associated with the risk of developing inflammatory bowel disease (IBD) and the early age of disease onset. However, there are no reports regarding the relationship with clinical characteristics and disease severity.
AIM To summarise that APOE polymorphisms are associated with the risk of developing IBD and the early age of disease onset.
METHODS In total, 406 patients aged 3-18 with IBD (192 had ulcerative colitis and 214 had Crohn’s disease) were genotyped using the TaqMan hydrolysis probe assay. Clinical expression was described at diagnosis and the worst flare by disease activity scales, albumin and C-reactive protein levels, localisation and behaviour (Paris classification). Systemic steroid intake with the total number of courses, immunosuppressive, biological, and surgical treatment with the time and age of the first intervention were determined. The total number of exacerbation-caused hospitalisations, the number of days spent in hospital due to exacerbation, the number of relapses, and severe relapses were also estimated.
RESULTS Ulcerative colitis patients with the APOEε4 allele had lower C-reactive protein values at diagnosis (P = 0.0435) and the worst flare (P = 0.0013) compared to patients with the APOEε2 allele and genotype APOEε3/ε3. Crohn’s disease patients with the APOEε2 allele scored lower on the Pediatric Crohn’s Disease Activity Index at diagnosis (P = 0.0204). IBD patients with APOEε2 allele spent fewer days in the hospital due to relapse (P = 0.0440).
CONCLUSION APOE polymorphisms are associated with the risk of developing IBD and the clinical expression of IBD. However, the clinical relevance of the differences identified is rather modest.
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Affiliation(s)
- Aleksandra Glapa-Nowak
- Department of Pediatric Gastroenterology and Metabolic Diseases, Poznań University of Medical Sciences, Poznań 60-572, Poland
| | - Mariusz Szczepanik
- Department of Pediatric Gastroenterology and Metabolic Diseases, Poznań University of Medical Sciences, Poznań 60-572, Poland
| | - Barbara Iwańczak
- Department of Pediatrics, Medical University of Wroclaw, Wroclaw 50-369, Poland
| | - Jarosław Kwiecień
- Department of Pediatrics, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Zabrze 41-800, Poland
| | | | - Urszula Grzybowska-Chlebowczyk
- Department of Pediatrics, Faculty of Medical Sciences, Medical University of Silesia in Katowice, Katowice 40-752, Poland
| | - Marcin Osiecki
- Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, The Children’s Memorial Health Institute, Warsaw 04-730, Poland
| | - Marcin Dziekiewicz
- Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw 02-091, Poland
| | - Andrzej Stawarski
- Department and Clinic of Pediatrics, Gastroenterology and Nutrition, Wroclaw Medical University, Wroclaw 50-369, Poland
| | - Jarosław Kierkuś
- Department of Gastroenterology, Hepatology, Feeding Disorders and Paediatrics, The Children’s Memorial Health Institute, Warsaw 04-730, Poland
| | - Tomasz Banasiewicz
- Chair and Department of General Surgery, Gastroenterological Surgical Oncology and Plastic Surgery, Poznań University of Medical Sciences, Poznań 60-355, Poland
| | - Aleksandra Banaszkiewicz
- Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw 02-091, Poland
| | - Jarosław Walkowiak
- Department of Pediatric Gastroenterology and Metabolic Diseases, Poznań University of Medical Sciences, Poznań 60-572, Poland
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Integrated omics profiling of dextran sodium sulfate-induced colitic mice supplemented with Wolfberry ( Lycium barbarum). NPJ Sci Food 2020; 4:5. [PMID: 32258419 PMCID: PMC7109062 DOI: 10.1038/s41538-020-0065-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 02/14/2020] [Indexed: 12/11/2022] Open
Abstract
We used a multi-omics profiling approach to investigate the suppressive effects of 2% Wolfberry (WOL)-enriched diets on dextran sodium sulfate (DSS)-induced colitis in mice. It was observed that in mice fed the WOL diet, the disease activity index, colon shortening, plasma concentrations of matrix metalloproteinase-3 and relative mesenteric fat weight were significantly improved as compared to the DSS group. Results from colon transcriptome and proteome profiles showed that WOL supplementation significantly ameliorated the expression of genes and proteins associated with the integrity of the colonic mucosal wall and colonic inflammation. Based on the hepatic transcriptome, proteome and metabolome data, genes involved in fatty acid metabolism, proteins involved in inflammation and metabolites related to glycolysis were downregulated in WOL mice, leading to lowered inflammation and changes in these molecules may have led to improvement in body weight loss. The integrated nutrigenomic approach thus revealed the molecular mechanisms underlying the ameliorative effect of whole WOL fruit consumption on inflammatory bowel disease.
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Zhang Y, Shen B, Zhuge L, Xie Y. Identification of differentially expressed genes between the colon and ileum of patients with inflammatory bowel disease by gene co-expression analysis. J Int Med Res 2019; 48:300060519887268. [PMID: 31822145 PMCID: PMC7251957 DOI: 10.1177/0300060519887268] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE We aimed to identify differentially expressed genes (DEG) in patients with inflammatory bowel disease (IBD). METHODS RNA-seq data were obtained from the Array Express database. DEG were identified using the edgeR package. A co-expression network was constructed and key modules with the highest correlation with IBD inflammatory sites were identified for analysis. The Cytoscape MCODE plugin was used to identify key sub-modules of the protein-protein interaction (PPI) network. The genes in the sub-modules were considered hub genes, and functional enrichment analysis was performed. Furthermore, we constructed a drug-gene interaction network. Finally, we visualized the hub gene expression pattern between the colon and ileum of IBD using the ggpubr package and analyzed it using the Wilcoxon test. RESULTS DEG were identified between the colon and ileum of IBD patients. Based on the co-expression network, the green module had the highest correlation with IBD inflammatory sites. In total, 379 DEG in the green module were identified for the PPI network. Nineteen hub genes were differentially expressed between the colon and ileum. The drug-gene network identified these hub genes as potential drug targets. CONCLUSION Nineteen DEG were identified between the colon and ileum of IBD patients.
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Affiliation(s)
- Yuting Zhang
- Institute of Gastroenterology, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, P. R. China.,Department of Liver Diseases, People's Hospital of Yichun City, Yichun, Jiangxi Province, P. R. China
| | - Bo Shen
- Department of Hepatobiliary Surgery, People's Hospital of Yichun City, Yichun, Jiangxi Province, P R China
| | - Liya Zhuge
- Institute of Gastroenterology, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, P. R. China
| | - Yong Xie
- Institute of Gastroenterology, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, P. R. China.,Department of Gastroenterology, the First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi Province, P R China
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Tanhapour M, Miri A, Vaisi-Raygani A, Bahrehmand F, Kiani A, Rahimi Z, Pourmotabbed T, Shakiba E. Synergism between apolipoprotein E Ɛ4 allele and paraoxonase (PON1) 55-M allele is associated with risk of systemic lupus erythematosus. Clin Rheumatol 2017; 37:971-977. [PMID: 29273831 DOI: 10.1007/s10067-017-3859-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 08/19/2017] [Accepted: 09/27/2017] [Indexed: 12/18/2022]
Abstract
Evidences indicate that abnormal lipid metabolism and lipid peroxidation can affect the progression of complications in systemic lupus erythematosus (SLE) patients. Apolipoprotein E (ApoE) and paraoxonase-1 (PON1) play important role in lipid metabolism and protection of lipid peroxidation. The polymorphisms of ApoE and paraoxonase (PON1) L55M (Met < Leu) allele genes lead to disorders in lipid metabolism and are related to atherosclerosis. This study is the first investigation to examine the possible association between ApoE and PON1-L55M polymorphisms and correlation with serum arylesterase (ARE) activities of PON, levels of malondialdehyde (MDA), neopterin, and lipid lipoprotein in SLE patients from Iranian western population. The present case-control study consisted of 107 SLE patients and 101 gender- and age-matched, unrelated, healthy controls from Iran's western population. The ApoE and PON1-L55M genotypes were identified using PCR-RFLP method. The serum level of MDA, neopterin, lipid levels, and ARE activity were determined by HPLC, commercial kits, and spectrophotometry, respectively. Our results showed that ApoE ε4 and PON1-55M alleles act synergistically to increase the risk of SLE by 1.47 times (p = 0.038). We found that the frequency of ApoE Ɛ3/Ɛ4 genotype was higher in SLE patients (11.2%) compared with control subjects (5%), although the difference was not significant (p = 0.087). This study for the first time not only demonstrates that ApoE Ɛ4 and PON-55M alleles synergistically increase the risk of SLE but also reveals that serum levels of MDA, neopterin, and LDL-C are high in SLE patients. This information may be in value for evaluating SLE progression and in the elucidation of the mechanisms of the disease pathogenesis.
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Affiliation(s)
- Maryam Tanhapour
- Fertility and Infertility Research Center, School of Medicine, Kermanshah University of Medical Sciences, Daneshgah Avenue, PO Box 6714869914, Kermanshah, Iran
| | - Ali Miri
- Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Daneshgah Avenue, PO Box 6714869914, Kermanshah, Iran
| | - Asad Vaisi-Raygani
- Fertility and Infertility Research Center, School of Medicine, Kermanshah University of Medical Sciences, Daneshgah Avenue, PO Box 6714869914, Kermanshah, Iran.
- Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Daneshgah Avenue, PO Box 6714869914, Kermanshah, Iran.
| | - Fariborz Bahrehmand
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Amir Kiani
- Department of Toxicology and Pharmacology, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Zohreh Rahimi
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Tayebeh Pourmotabbed
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee, Health Science Center, Knoxville, TN, USA
| | - Ebrahim Shakiba
- Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Daneshgah Avenue, PO Box 6714869914, Kermanshah, Iran.
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ApoE deficiency promotes colon inflammation and enhances inflammatory potential oxidized-LDL and TNF-α in colon epithelial cells. Biosci Rep 2016; 36:BSR20160195. [PMID: 27538678 PMCID: PMC5052706 DOI: 10.1042/bsr20160195] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 08/18/2016] [Indexed: 12/12/2022] Open
Abstract
Although deficiency in Apolipoprotein E (ApoE) is linked to many diseases, its effect on colon homoeostasis remains unknown. ApoE appears to control inflammation by regulating nuclear factor-κB (NF-κB). The present study was designed to examine whether ApoE deficiency affects factors of colon integrity in vivo and given the likelihood that ApoE deficiency increases oxidized lipids and TNF-α, the present study also examined whether such deficiency enhances the inflammatory potential of oxidized-LDL (oxLDL) and TNF-α in colon epithelial cells (CECs), in vitro. Here we show that ApoE deficiency is associated with chronic inflammation systemically and in colonic tissues as assessed by TNF-α levels. Increased colon TNF-α mRNA coincided with a substantial increase in cyclooxygenase (COX)-2. ApoE deficiency enhanced the potential of oxLDL and TNF-α to induce COX-2 expression as well as several other inflammatory factors in primary CECs. Interestingly, oxLDL enhanced TGF-β expression only in ApoE−/−, but not in wild-type, epithelial cells. ApoE deficiency appears to promote COX-2 expression enhancement through a mechanism that involves persistent NF-κB nuclear localization and PI3 and p38 MAP kinases but independently of Src. In mice, ApoE deficiency promoted a moderate increase in crypt length, which was associated with opposing effects of an increase in cell proliferation and apoptosis at the bottom and top of the crypt respectively. Our results support the notion that ApoE plays a central role in colon homoeostasis and that ApoE deficiency may constitute a risk factor for colon pathologies.
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Inhibition of Interleukin-10 Signaling Induces Microbiota-dependent Chronic Colitis in Apolipoprotein E Deficient Mice. Inflamm Bowel Dis 2016; 22:841-52. [PMID: 26891260 PMCID: PMC4792726 DOI: 10.1097/mib.0000000000000699] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Apolipoprotein E (ApoE) mediates potent antiinflammatory and immunomodulatory properties in addition to its roles in regulating cholesterol transport and metabolism. However, its role in the intestine, specifically during inflammation, is largely unknown. METHODS Mice (C57BL/6 or ApoE-deficient [ApoE-KO] mice) were administered either single or 4 injections (weekly) of anti-interleukin (IL)-10 receptor monoclonal antibody (1.0 mg/mouse; intraperitoneally) and euthanized 1 week after the last injection. 16S rRNA sequencing was performed in fecal samples to analyze the gut bacterial load and its composition. Microbiota was ablated by administration of broad-spectrum antibiotics in drinking water. IL-10KO mice were cohoused with ApoE-KO mice or their wild-type littermates to monitor the colitogenic potential of gut microbiota harbored in ApoE-KO mice. RESULTS ApoE-KO mice developed severe colitis upon neutralization of IL-10 signaling as assessed by every parameter analyzed. 16S rRNA sequencing revealed that the ApoE-KO mice display elevated and altered gut microbiota that were accompanied with impaired production of intestinal antimicrobial peptides. Interestingly, microbiota ablation ameliorates colitis development in ApoE-KO mice. Exacerbated and accelerated colitis was observed in IL-10KO mice when cohoused with ApoE-KO mice. CONCLUSIONS Our study highlights a novel interplay between ApoE and IL-10 in maintaining gut homeostasis and that such crosstalk may play a critical role in the pathogenesis of inflammatory bowel disease. Gut sterilization and the cohousing experiment suggest that microbiota play a pivotal role in the development of inflammatory bowel disease in mice lacking ApoE.
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